Reference

Lookup material for the whole curriculum. Nothing here needs reading in order.

Reference	Contents
Port Cheatsheet	Every port you can be asked about
Command Reference	Windows and Linux diagnostics
Glossary	Terms defined precisely

Why this exists

Interviews compress. You will be asked "what port is that?" or "how would you check it?" and you want a two-second answer, not a paragraph. These three pages exist so you can drill recall rather than re-read chapters.

How to use it for revision

★Tip

Cover the tables and try to answer from memory. Reading a table teaches you nothing; recalling one does. Use Lab 5 for the timed, spoken version.

The twenty questions

If you can answer these cold, you are ready:

1. Which port does RDP use? 3389
2. Which port does DNS use? 53 (UDP for queries, TCP for transfers)
3. What does a 169.254 address mean? DHCP failed
4. What does DORA stand for? Discover, Offer, Request, Acknowledge
5. Difference between refused and timed out? Nothing listening vs a firewall dropping
6. What does gpresult /r tell you? Which policies applied, and why
7. What is the difference between NTFS and share permissions? More restrictive wins
8. What is Kerberos? Ticket-based AD auth; passwords never cross the network again
9. /24 usable hosts? 254
10. What is a snapshot? Point-in-time state, not a backup
11. RPO vs RTO? Tolerable data loss vs tolerable downtime
12. What does a truncated ping mean? An ICMP-unreachable response came back
13. Hub vs switch? One collision domain vs one per port
14. What is the native VLAN? The untagged VLAN on a trunk
15. What does w32tm /resync fix? Clock skew breaking Kerberos
16. Which event IDs suggest a failing disk? 7 and 51
17. What service must be running to print? Spooler
18. What is the SPF record type? TXT
19. Full vs incremental vs differential? Everything / since any backup / since last full
20. What is least privilege? Minimum rights needed for the task

Version

Written for Docusaurus 3.10.2, covering the interview material for a Desktop Support / Network / Server Administration role.